Every large replacement programme begins with an assessment nobody can verify; months of manual analysis, a spreadsheet of estimates, and a plan built on assumptions. Tacit produces the architectural truth first: what runs, what is dead, what a rule actually does, and where the dependencies really point.
Built for Tier 1 banks and insurers · Runs inside your perimeter · DACH first
By the time code is being rewritten, the expensive mistakes are already made; the wrong systems were scoped, dead programmes were carried forward, and business rules that mattered were never found. The assessment that set the budget was an opinion, delivered as a document, priced by the day.
Complexity scores and effort figures that cannot be traced back to a line of source. When the number is challenged, nobody can show the derivation.
Programmes and paragraphs that have not executed in a decade get scoped, estimated, converted and tested; paid for twice, once to move and once to maintain.
The logic the business depends on exists only as COBOL. It was never documented, the people who wrote it have retired, and no conversion tool recovers intent.
Tacit is not a code converter; that market is crowded and nobody trusts the output. Tacit is the layer that comes first: a parsed, verifiable model of the estate that every later decision rests on. Conversion is a downstream problem, and it is a much cheaper one once the estate is actually known.
The structural findings are derived from a parser, not inferred. Where a judgement is a model judgement, the report says so. Verification discipline
Each module answers a question a programme director has to answer anyway, with output that survives being questioned.
PROGRAM CALC-INTEREST
REACHABLE MAIN-DRIVER → PROCESS-LOAN → CALC-INTEREST
COMPLEXITY 340 lines · cyclomatic 18
RULE Interest accrues daily from WS-RATE-TABLE, compounded
monthly unless WS-ACCOUNT-TYPE = 'PREMIUM'.
EVIDENCE CALC-INTEREST.cbl:142–168
Illustrative — not live output. Full evidence trail, per programme, on request.
Tacit was designed for locked down environments from the first commit; the model endpoint is a configuration value, not a hard dependency. The same codebase runs in all three modes.
Deployed on an internal VM with a model server alongside it. No egress, no external calls, nothing leaves the VDI perimeter.
Points at your own Azure OpenAI or Bedrock endpoint; inference stays inside contracts you already hold.
Run by us in the EU for evaluation and pilots, where source sensitivity permits it.
If you are being asked to commit a nine figure budget on the strength of a hand written assessment, the assessment is the risk. Tacit replaces the part of that work that should never have been manual.
Tacit is built by a solution architect with twenty two years working on core banking and insurance platforms across COBOL, DB2, CICS, JCL, VSAM and PL/1, delivered inside European institutions. The product is that method, encoded; the moat is the method, not the machinery.
Berlin, Germany
Send us a single programme and its copybooks. You get the estate model back, and you can check it against what your own architects believe. That is the whole pitch.